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High latency seen, but not in qos statistics volume latency show

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Category:
ontap-9
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perf
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Applies to

  • Clustered Data ONTAP 8.3
  • ONTAP 9
  • CIFS or NFS connections

Issue

High latency is seen in Unified Manager, but running "qos statistics volume latency show" does not indicate a delay.

Example for data1 volume:

nas-cm95::> qos statistics volume performance show
Workload            ID     IOPS       Throughput    Latency
--------------- ------ -------- ---------------- ----------
-total-              -       78         0.07KB/s  111.01ms
data1-wid30897   30897       78         0.07KB/s  521.01ms
-total-              -       84         0.07KB/s  111.01ms
data1-wid30897   30897       84         0.07KB/s  521.01ms
-total-              -      158         0.08KB/s  111.01ms
data1-wid30897   30897      158         0.08KB/s  521.01ms
-total-              -      158         0.08KB/s  111.01ms
data1-wid30897   30897      158         0.08KB/s  521.01ms
nas-cm95::> qos statistics volume latency show
Workload            ID    Latency    Network    Cluster       Data       Disk        QoS      NVRAM      Cloud  FlexCache    SM Sync
--------------- ------ ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
-total-              -   367.00us   155.00us     3.00us   161.00us        0ms        0ms     0.00us        0ms        0ms        0ms
data1-wid30897   30897   312.00us   160.00us        0ms   152.00us        0ms        0ms     0.00us        0ms        0ms        0ms
-total-              -   902.00us   153.00us     5.00us   151.00us     8.00us        0ms     0.00us        0ms        0ms        0ms
data1-wid30897   30897   307.00us   150.00us        0ms   149.00us     8.00us        0ms     0.00us        0ms        0ms        0ms
-total-              -  1139.00us   149.00us     7.00us   141.00us     9.00us        0ms     0.00us        0ms        0ms        0ms
data1-wid30897   30897   284.00us   145.00us        0ms   138.00us     1.00us        0ms     0.00us        0ms        0ms        0ms
-total-              -   343.00us   147.00us     5.00us   145.00us        0ms        0ms     0.00us        0ms        0ms        0ms
data1-wid30897   30897   286.00us   146.00us        0ms   140.00us        0ms        0ms     0.00us        0ms        0ms        0ms

A Unified Manager alert is demonstrated below where it can show the latency in the Network processing center:

GUID-D1E0E5FC-ED2D-4447-B348-AD52F5CB3307-low.gif

 

 

 

 

 

 

 

 

 

 

There may be no delay centers showing any significant latency, but client side reports high latency.

 

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